期刊
CHEMISTRY OF MATERIALS
卷 27, 期 14, 页码 4983-4994出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b01368
关键词
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资金
- Japan Society for the Promotion of Science [26289240]
- National Natural Science Foundation of China [21005003]
- Doctoral Scientific Research Starting Foundation of Baoji University of Arts and Science [ZK15050]
- Grants-in-Aid for Scientific Research [26289240] Funding Source: KAKEN
A platelike mesocrystalline BaTiO3/SrTiO3 (BT/ST) nanocomposite is prepared via a clever two-step solvothermal soft chemical process. First a protonated titanate H1.07Ti1.73O4 center dot nH(2)O (HT) crystal with a layered structure and platelike morphology is solvothermally treated in a Ba(OH)(2) solution to generate a homogeneous platelike BaTiO3/HT (BT/HT) nanocomposite. Second the generated BT/HT nanocomposite is solvothermally treated in a Sr(OH)(2) solution to generate the mesocrystalline BT/ST nanocomposite with platelike particle morphology. The transformation reactions from the HT precursor to the mesocrystalline BT/ST nanocomposite are topochemical conversion reactions, and the formed BT/ST nanocomposite is constructed from well-aligned BT and ST nanocrystals in the same crystal-axis orientation. The BT/ST nanocomposite annealed at 900 degrees C shows a ferroelectric behavior and drastically enhanced piezoelectric and dielectric responses owing to the introduction of a lattice strain at a three-dimensional heteroepitaxial interface between the BT and ST nanocrystals in the mesocrystal. The nanostructure of the BT/ST mesocrystal is suitable for simultaneous application of the strain engineering and the orientation engineering to develop high performance piezoelectric and dielectric materials.
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